Randy, clear all!

Restart on another way.

Now i write the same program into two ways.

Way #1, this work:

clear
CREATE CURSOR test (f1 I NULL)
TRY
	INSERT INTO test VALUES (NULL)
	INDEX ON F1 FOR F1>0 TAG T1 CANDIDATE
	SET ORDER TO 0
CATCH
	? MESSAGE()
ENDTRY
BROWSE

Way #2, this doesn't work:

clear
CREATE CURSOR test (f1 I NULL)
TRY
	INDEX ON F1 FOR F1>0 TAG T1 CANDIDATE
	INSERT INTO test VALUES (NULL)
	SET ORDER TO 0
CATCH
	? MESSAGE()
ENDTRY
BROWSE